Get the ventilation you want when you want it. Heavy-duty steel base with transparent, smoke gray, all-weather butyrate domes. Van roof vent installs easily with an inner trim ring for a vehicle with rear headliners. Choose non-powered, or power, which includes a 12-volt fan unit. Template for installation and all hardware included. Each vent measures 14" square and has a dome which admits light into the cargo area of the van.